OMI-DB Statistics

The OPTIMAM1 project was initiated in 2008, aiming to optimise the adoption of new X-ray technology for detecting breast cancers and thereby to improve the early detection of breast cancers in the NHS Screening Programme. OPTIMAM1 was followed by OPTIMAM2 (2013). The Scientific Computing team, at the Royal Surrey NHS Foundation Trust is responsible for the maintenance of the OPTIMAM Database (OMI-DB), which contains over 8,000,000 processed and unprocessed FFDM, Tomosynthesis and MR images. Screening information is collected from National Breast Screening System (NBSS). Sets of normal, benign and malignant images are selectively collected from multiple NHS sites.

OMI-DB comprises multiple screening datasets (episodes) from multiple clients (cases) who may or may not have been identified with a benign/malignant lesion. Each client's screening dataset contains two views of each breast (medio-lateral oblique and cranio-caudal). Associated tools have been developed to:

identify patient cases of interest from the National Breast Screening System (NBSS)
automatically retrieve corresponding images from the site’s PACS together with any associated radiological, clinical and pathological data from local databases that may be of interest
de-identify collected images
allow remote expert radiologists to annotate the images with interesting clinical features and provide descriptors of these features.

All collected cases retrieved from the database are classified as Normal, Benign, Malignant, or Interval Cancers. The Malignant cases are sub-classified into Malignant-Marked and Malignant-Unmarked, depending on if they have been annotated by an OPTIMAM expert image reader or not. The definitions are:

Interval Cancer: symptomatic cases in the current year which are classified as malignant after a previous screening appointment at which a client received a normal result and before their next scheduled screening appointment, or previously classified as interval cancer
Malignant: cases that are classified as malignant by either surgery, or biopsy, or previously classified as malignant
Benign: cases that are classified as benign by either surgery, or biopsy, or previously classified as benign
Normal: cases not classified as malignant or benign, or interval cancer

It should be noted that some clients have multiple events in different years.

A high level summary of all data in OMI-DB is given in the tables below.

OMI-DB Totals+


Clients	1,038,073
Studies	2,971,781
Images	13,901,207

Overall Outcome, Client Count+

Outcome
Malignant	35,189
Interval Cancers	8,789
Benign	23,543
Normal	937,356
Unknown	33,196

Site, Client Count+

Site
Site 1	90,534
Site 2	19,982
Site 3	681
Site 4	132,725
Site 5	117,583
Site 6	172,362
Site 7	130,996
Site 8	121,788
Site 9	36,106
Site 10	56,804
Site 11	78,199
Site 12	39,006

Client Age At Screening+

Age
25-29	9
30-34	42
35-39	113
40-44	3,513
45-49	155,401
50-54	671,505
55-59	657,170
60-64	577,562
65-69	487,912
70-74	176,188
75-79	33,575
80-84	10,915
85-89	2,252
90-94	201
95-100	6

Marked Cases By Client Outcome, Client Count+

Outcome
Malignant Marked	7,198
Prior to Interval Cancer Marked	83
Benign Marked	1,409
Total	8,690

Marked Cases By Episode Outcome, Episode Count+

Outcome
Malignant Marked	7,354
Prior to Interval Cancer Marked	42
Benign Marked	1,420
Total	9,294

Unprocessed And/ Or Processed Screening Images, Client Count+


Processed only	794,178
Unprocessed and Processed	242,529

Screening Episode Outcome By Year, Episode Count+

Outcome	2003	2008	2009	2010	2011	2012	2013	2014	2015	2016	2017	2018	2019	2020	2021	2022	2023	2024	2025
Malignant	0	0	6	272	1,172	2,151	2,781	3,324	3,212	3,283	3,522	3,547	3,295	1,570	3,027	1,754	1,294	1,112	25
Interval Cancer	0	0	0	0	1	0	0	1	0	1	0	0	0	0	0	0	0	0	0
Prior to Malignant	0	0	64	613	1,511	1,837	2,245	2,750	2,741	2,795	2,490	1,949	1,203	478	774	104	6	2	0
Prior to Interval Cancer	0	0	4	106	429	840	973	1,067	1,056	797	1,021	983	770	296	385	159	46	9	0
Benign	0	0	3	534	1,716	1,743	2,446	3,291	2,309	2,691	2,009	1,654	1,644	797	1,624	626	1,099	431	5
Normal	1	23	1,291	53,715	151,231	154,674	217,348	288,679	224,886	275,773	267,054	212,115	226,056	97,468	207,792	105,330	125,671	67,602	7,611
Unknown	0	0	0	0	1	0	0	2	0	2	1	1	1	0	0	0	0	0	0

Screening Episode Outcome, Episode Count+

Outcome
Malignant	35,143
Interval Cancer	3
Prior to Malignant	21,345
Prior to Interval Cancer	8,797
Benign	24,506
Normal	2,668,679
Unknown	8

Manufacturer By Year, Episode Count+

Manufacturer	2003	2008	2009	2010	2011	2012	2013	2014	2015	2016	2017	2018	2019	2020	2021	2022	2023	2024	2025
Hologic	0	0	755	42,737	128,608	118,138	169,746	221,021	157,992	211,320	183,386	136,926	142,825	52,697	113,145	37,950	58,636	25,735	3,042
Siemens	1	0	4	9,054	18,169	24,763	31,155	51,932	54,098	46,168	64,212	56,305	54,715	31,189	77,235	52,074	52,310	36,284	4,556
GE Healthcare	0	21	583	2,602	6,314	15,821	21,427	21,427	18,234	24,235	23,416	23,875	31,970	14,782	20,416	15,648	15,341	5,949	0
Philips	0	0	1	33	952	116	484	1,523	991	522	1,939	322	242	0	0	0	0	0	0
Other/Unknown	0	0	11	164	71	11	37	41	116	298	65	172	766	442	443	1,106	428	637	15

Manufacturer, Episode Count+

Manufacturer
Hologic	1,825,227
Siemens	664,235
GE Healthcare	262,293
Philips	7,125
Other/Unknown	4,823

Imaging Modality, Client Count+

Modality
Full Field Digital Mammography only	1,016,279
Full Field Digital Mammography and Digital Breast Tomosynthesis	21,733
Digital Breast Tomosynthesis only	61

Imaging Modality, Episode Count+

Modality
Full Field Digital Mammography only	4,335,464
Full Field Digital Mammography and Digital Breast Tomosynthesis	21,964
Digital Breast Tomosynthesis only	223

Cancer Type, Client Count+

Cancer type
Invasive	27,202
In-situ	8,661

Cancer Type, Episode Count+

Cancer type
Invasive	27,250
In-situ	8,686

Aggregate statistics describing the portion of OMI-DB available for sharing are given in the tables below. These statistics describe the number of clients or episodes for various characteristics of the data.